Aug 2015 - cat pipe grep redirect
short for concatenate - used to either view the contents of a file, or concatenate 2 or more files together
- pipe |
used to link/pipe the output of one command into the input of another command.
used to search for a string of characters
- redirect output >
* cat file1.txt #this will show the whole file * cat bigfile.txt | more #this will display one page at a time!
* cat file1 file2 > file3 #this will combine file1 and file2 and redirect the output into file3.
* grep string1 file3 #this will search file3 for string1 and display all the results.
* grep string1 file3 > file4 #this will save the results to file4 (overwriting it if it had existed before). * grep string1 file3 >> file4 #this will append the results to file4 (creating it if it had not existed before).